SMI West (Smoke Management Instructions) Western Oregon Smoke Management Instructions

Mon Apr 6 07:52:16 PDT 2009

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, April 6, 2009       7:30 AM      Jim Little

1.  DISCUSSION AND FORECAST FOR THE WESTERN OREGON AREA FORECAST ZONES 601-623

A strong upper level ridge of high pressure lies on an axis from southern Nevada to northern Idaho.  Offshore a deep upper level trough lies about 600 miles west-southwest of San Francisco and an upper trough is just off the British Columbia coast.  At the surface the highest pressures are over western Montana and northern Colorado, while a reflection of the upper level low off the California coastline is located west-southwest of San Francisco.  The net result is a light north or northeasterly flow most areas.  Mixing heights along the coast will be suppressed.  South Cascades mixing heights should be 5000 feet or better by this afternoon.  Smoke dispersal conditions will be fair to good over the region.

2.  DISPERSION

Zone 601, 602, 603 and 612 (North Coast Range):

MORNING
Mixing height below 1000 ft.
Transport wind N to NE at 4 - 8 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 1000 - 1800 ft.
Transport wind NNW to N at 8 - 12 mph.
Surface wind increases to NW to N at 6 - 12 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNW to NNE at 10 - 18 mph.
Surface wind NW to N at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height 1300 - 2300 ft.
Transport wind ENE to ESE at 4 - 8 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 3000 - 4000 ft.
Transport wind shifts to NNW to NNE at 8 - 12 mph.
Surface wind increases to NNW to NE at 5 - 9 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNW to NNE at 8 - 14 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 1000 - 1800 ft.
Transport wind light and variable and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 1500 - 2500 ft.
Transport wind shifts to NNW to NNE at 5 - 9 mph.
Surface wind increases to NW to N at 6 - 12 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNE to ENE at 8 - 12 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING
Mixing height 2000 - 3000 ft.
Transport wind ESE to SSE at 4 - 8 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind becomes light and variable and controlled by local terrain.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind increases to E to SE at 6 - 10 mph.
Surface wind similar to afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Monday, April 6, 2009.
=================================================================

Coast Range

Zone 601, 612, and 616 east of R9W
Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.

Zone 602, 603, and 620
No burning allowed.  Some burning is possible south of T17S in Zone 603.  Call the forecaster.  Some burning allowed south of the Rogue River in Zone 620.  Call the forecaster.

Zone 615
Units should be 1500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 618 and 619
Use standard guidance matrix. (See section 5 below.)

Cascades

Zone 605 and 606
Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA.  Higher tonnage is possible south of T20S in Zone 606.  Call the forecaster.

Zone 607, 608, 609, and 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 610
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616, 617, and 623
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 620 and 622
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Siskiyous
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

==============================================================
4.  SPECIAL NOTE:

    Call the smoke management duty forecaster at (503) 945-7401 to
    discuss burning.  Please do not call individual's numbers to
    discuss daily burning.  If the forecaster is not available,
    leave a message and he will return your call as soon as possible.
    Avoid calling between 2 to 2:30 p.m.

    The forecast is available on the Internet at:
      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management

    Please ensure your units have been planned and accomplished by checking:
      http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml

5.  STANDARD GUIDANCE MATRIX:

  * Greater than 5000 ft mixing height:  No burning within 5 miles of
    downwind SSRA.  Maximum 100 tons per mile from downwind SSRA.
    Example:  500 ton maximum allowed if burned 5 miles from downwind SSRA.

  * 3000 - 5000 ft mixing height:  No burning within 10 miles of
    downwind SSRA.  Maximum 75 tons per mile from downwind SSRA.
    Example:  750 ton maximum allowed if burned 10 miles from downwind SSRA.

  * Less than 3000 ft mixing height:  No burning within 15 miles of
    downwind SSRA.  Maximum 50 tons per mile from downwind SSRA.
    Example:  750 ton maximum allowed if burned 15 miles from downwind SSRA.

  * All exceptions must be coordinated with the duty forecaster
    prior to ignition.

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